Interim Deputy Fire Chief Avery Webb said a mattress caught fire in a dormer room at the top of the house and the blaze spread to the second story below.

Webb estimated the damage to the home was valued at $800,000.

Nobody was at home at 1177 Keith Ave. when the fire started, according to Webb.

A neighbor called the home’s owner, believed to be Heidi Tarver, to alert her to the fact that the home was ablaze. The Berkeley Fire Department received a first call at 11:47 a.m. The fire was fully extinguished by about 2:00 p.m.